New EPA Guidance On Diesel Exhaust Fluid (DEF)

Diesel owners who have wrestled with warning lights, sudden power loss or even complete shutdowns tied to diesel exhaust ...
Morning Overview on MSN

EPA drops DEF sensor requirement after Trump push, reports say

The Environmental Protection Agency announced on March 27, 2026, that it is removing the diesel exhaust fluid sensor ...
Advanced Clean Tech (ACT) News

EPA Targets DEF System Failures, Offering Relief for Heavy-Duty Truck Operations

EPA’s latest move on diesel exhaust fluid systems aims to reduce unexpected derates and costly downtime, both persistent ...
CarBuzz

Apparently, Feds Are Fed-Up With DEF Diesel Systems, Too

Added information on DEF / DPF system history for on-road and off-road diesel-powered vehicles and equipment. The run of ...
DRGNews

Action to Address Diesel Exhaust Fluid (DEF) System Complaints

For more information, please see EPA’s Diesel Exhaust Fluid. Since 2010, most on-road diesel trucks and many types of nonroad ...
Commercial Carrier JournalOpinion

End of DEF quality sensors a win for reliability, but what about the environment?

Selective catalyst reduction (SCR) systems were introduced in 2010 in the United States to meet the NOx requirements. With an ...
Trucking Info

EPA Targets DEF Sensor Failures Behind Truck Derates

New guidance allows engine makers to replace problematic DEF sensors with NOx-based systems, aiming to reduce unnecessary ...
Transport Topics

EPA Moves to Address DEF System Failures

EPA approved guidance allowing diesel manufacturers to replace urea quality sensors with NOx sensors in DEF systems. The agency said faulty DEF sensors are a significant source of warranty claims and ...
Transport Topics

EPA Gives Engine Makers 30 Days to Provide DEF System Data

The data collected will allow EPA to independently evaluate ongoing system failures. As of Feb. 2, engine manufacturers have 30 days to provide EPA with data on model years 2016, 2019 and 2023 ...